甲基丙烯酸偶联二氧化钛对自凝树脂机械性能的影响

发布时间：2018-01-18 12:00

本文关键词：甲基丙烯酸偶联二氧化钛对自凝树脂机械性能的影响　出处：《吉林大学学报(医学版)》2015年05期 　论文类型：期刊论文

【摘要】：目的:探讨纳米二氧化钛(TiO2)和甲基丙烯酸(MAA)偶联后活化的TiO2(F-TiO2)对聚甲基丙烯酸甲酯(PMMA)机械性能的影响。方法:选用颗粒径为510nm的TiO2及纯度为99.99%的MAA制备F-TiO2,采用傅立叶红外光谱(FT-IR)和X射线衍射图谱(XRD)对F-TiO2进行结构表征;采用原位聚合法制备TiO2/PMMA、F-TiO2/PMMA纳米复合树脂,根据偶联剂MAA的有无及TiO2质量比将试件分为空白组、2%TiO2组、4%TiO2组、6%TiO2组、2%F-TiO2组、4%F-TiO2组和6%F-TiO2组,并利用电子透射电镜(TEM)和电子万能试验机测试分析TiO2在PMMA基质中的分散性及各组纳米复合树脂的机械性能(挠度、弯曲强度、弹性模量和抗冲击强度)。结果:TEM观察,放大倍数为1 500倍时,添加纳米颗粒浓度为6%,TiO2较F-TiO2颗粒团聚明显,TiO2在PMMA基质中不均匀分散,F-TiO2在PMMA基质中均匀分散。机械性能测试,TiO2组与F-TiO2组试件的弯曲强度和抗冲击强度均随着TiO2质量比上升而下降,且随着TiO2质量比增大,试件弯曲强度降低;与6%TiO2组比较,6%F-TiO2组试件的弯曲强度和抗冲击强度明显增大(P0.05)。TiO2质量比对弹性模量和挠度有明显影响,且随着TiO2质量比增大,TiO2组试件均表现出弹性模量逐渐降低但挠度升高的趋势,6%F-TiO2组试件弹性模量大于6%TiO2组;6%F-TiO2组试件(在压力为35和50N时)的挠度小于6%TiO2组(P0.05)。结论:试件纳米TiO2复合树脂较自凝树脂的机械性能低,而MAA偶联剂可提高纳米TiO2复合树脂的机械性能。
[Abstract]:Objective: to investigate the effect of TIO _ 2 / TIO _ 2) and MAA) on PMMA-polymethyl methacrylate (PMMA) by activated TIO _ 2O _ 2 F-TiO _ 2). Methods: F-TiO _ 2 was prepared by TiO2 with particle diameter of 510nm and MAA with purity of 99.99%. The structure of F-TiO _ 2 was characterized by Fourier transform infrared spectroscopy (FT-IR) and X-ray diffraction spectrum (XRD). TIO _ 2 / PMMA / F-TiO _ 2 / PMMA nanocomposite resin was prepared by in-situ polymerization. The samples were divided into blank group according to the availability of coupling agent MAA and the mass ratio of TiO2. (2) the content of TIO _ 2 in the TIO _ 2 group was 6: 2 in the F-TiO _ 2 group and in the F-TiO _ 2 group and in the 6F-TiO _ 2 group. The dispersion of TiO2 in PMMA matrix and the mechanical properties (deflection and flexural strength of each group of nanocomposite resins) were analyzed by electron transmission electron microscopy (TEM) and electronic universal testing machine. Results when the magnification ratio was 1,500 times, the agglomeration of F-TiO _ 2 particles was more obvious than that of F-TiO _ 2 particles. TiO2 was dispersed inhomogeneously in PMMA matrix. F-TiO _ 2 was uniformly dispersed in PMMA matrix. The bending strength and impact strength of TiO2 and F-TiO _ 2 samples decreased with the increase of TiO2 mass ratio, and the bending strength decreased with the increase of TiO2 mass ratio. Compared with the 6TiO _ 2 group, the flexural strength and impact strength of the F-TiO _ 2 group increased obviously, and the mass ratio of P0.05 路TIO _ 2 had a significant effect on the elastic modulus and deflection. With the increase of mass ratio of TiO2, the elastic modulus of the samples in the group of TiO2 decreased gradually, but the deflection increased. The elastic modulus of the samples of F-TiO _ 2 group was larger than that of the group of 6 TIO _ 2. The deflection of the 6F-TiO _ 2 sample (at pressures of 35 and 50 N) is less than that of the 6um TIO _ 2 group (P0.05). Conclusion: the mechanical properties of nano TiO2 composite resin are lower than that of self-coagulating resin. MAA coupling agent can improve the mechanical properties of nano TiO2 composite resin.
【作者单位】：吉林大学口腔医院正畸科;
【基金】：吉林省卫生厅科研基金资助课题(2010Z096)
【分类号】：R783
【正文快照】： 聚甲基丙烯酸甲酯(polymethylmethacrylate,PMMA)是在口腔正畸领域广泛应用的一种材料,根据其聚合固化方式一般分为加热固化型、室温固化型和光固化型。室温固化型在口腔正畸领域应用较多,如缺隙保持器、前庭盾和Nance弓等,但是患者长期佩戴后易产生软垢、色素沉积及细菌附着

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